diff --git a/Build.sh b/Build.sh
index ba9d987..be77b86 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.336 2008/07/10 18:49:22 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.337 2008/07/10 18:55:43 tg Exp $'
 #-
 # Environment used: CC CFLAGS CPPFLAGS LDFLAGS LIBS NOWARN NROFF TARGET_OS
 # CPPFLAGS recognised:	MKSH_SMALL MKSH_ASSUME_UTF8 MKSH_NOPWNAM MKSH_NOVI
@@ -330,6 +330,7 @@ OSF1)
 	HAVE_SIG_T=0	# incompatible
 	CPPFLAGS="$CPPFLAGS -D_OSF_SOURCE -D_POSIX_C_SOURCE=200112L"
 	CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=600 -D_XOPEN_SOURCE_EXTENDED"
+	: ${HAVE_SETLOCALE_CTYPE=0}
 	;;
 Plan9)
 	CPPFLAGS="$CPPFLAGS -D_POSIX_SOURCE -D_LIMITS_EXTENSION"